<?php
/**
 * Created by PhpStorm.
 * User: tangchao
 * Date: 19-4-19
 * Time: 下午3:04
 */

//return $this; 实现链式操作
namespace Lib;


class Database
{
    function where($where){
        return $this;
    }

    function order($order){
        return $this;
    }

    function limit($limit){
        return $this;
    }
}